Washington, Mar 6 : Rihanna's dad has lost contact with her and is worried that the singer has been cut her off from her family following alleged bust-up with Chris Brown.

Ronald Fenty said that he tried reaching out to his daughter after hearing she had been allegedly assaulted by Brown a month ago - but found that her email addresses and phone numbers had been changed.

Fenty has revealed that he and his other family members are getting updates about their daughter and Brown through press - because they've lost contact with the `Umbrella' hitmaker.

"I''ve been hearing so many stories... but I can''t get on to her. Her mother can''t get on to her, her brother told me she changed her email. Somebody has a stranglehold on her. I''m lost," Contactmusic quoted him, as telling Usmagazine. com.

"I''ll text the old numbers she had, and I call them. One girl answered, and she said, ''This is not Robyn''s (Rihanna) number anymore.'' I asked, ''Do you work for Robyn? Do you deal with Robyn?'' and the girl hung up, so I don''t know what''s going on anymore," he added. (ANI)